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Models of the Solar System

Use pages 78 to 81 in your science book to answer the questions. 
Across
Most ancient astronomers thought that all celestial objects revolved around ________.
Ge is the ______ word for “Earth."
Galileo discovered _____ moons around Jupiter.
Ptolemy’s model explained the ________ observed in the sky fairly accurately.
People became convinced that the heliocentric model is correct after evaluating evidence collected by _____ ______.
Earth is at the center of the revolving planets and stars in a(n) _________ model.
The fact that each planet’s orbit is an ellipse was discovered by ________.
The heliocentric system gained support when Galileo observed that _______ goes through phases similar to those of Earth’s moon.
Down
In the late 1500s, Ptolemy’s observations were supplanted by those of _______ ________.
________ is the Greek word for “sun."
The arrangement of the known planets and how they move around the sun was first worked out by Nicolaus ___________.
A(n) ________ is an oval shape, such as the planets’ orbits.
In a heliocentric system, Earth revolves around the _______.